Hi, Am installing to two flats with meters in a hall cupboard,with regards to each flat I intend to install a 16mm submain as follows,there is 100amp supply, 25mm tails to 63amp switch fuse, then from here 16mm twin and earth to each flat consumer unit. Is the 10mm earth (in the t+e sufficient for the main earth or will a seperate 16mm earth need to be installed? Many thanks